Cas 2.5-3-2-1-1T, Stable... at DDR508... at 2.2 Volts.

[Kunaak]

Probably the weirdest ram I ever came across...
this ram doesn't respond at all to voltages.
what it does do, is get more and more stable, the faster you overclock it... and the lower you let the voltages go.

for instance, 240 at cas 3-3-2-8-1T at first felt impossible, cause like anyone, I would think "ok, 2.6 volts isn't good... lets try 2.8" and so on.
well, after a time I forgot to set the voltage, when clearing a CMOS, I saw that I got into Memtest and it was running great.... at 2.5 volts.
weird I thought, and rebooted... set it to 2.6 volts... and it would get into memtest... and immediatly start to error...
out of grim curiousity I set it back to 2.5 volts... and Viola... stable.

that was with my ULtra D.
at that moment, I began thinking of trying to talk some friend of mine to mod a DFI bios to see if they could get me some lower voltages cause I had a feeling about something...
then I got a DFI Expert to use, and that has a option of going down as far as 2.3 volts... luckily it undervolts... so it really went down as low as 2.2 volts in my case... which for once, worked in my favor. ;)

now, I am even more curious to see what would happen if I could take the voltages even lower...

the settings you see here are boot up settings, they have not been adjusted in windows at all.
I chose a tras of 1, cause tras 0 shows up as a blank spot in CPUZ... I wanted it to be clearly shown that it was tras 1.

the Memtest shot below, has been running for the last 2 days straight, with the full test, not just test #5 for a burn in session, the entire test to make sure it's solid.
the 32M test is just to make sure its Windows stable and it is.
I only have 1 videocard at the moment, and thats in my Main PC, so I have not tested this in 3DMark or Gaming yet.

I've also screwed up the OS a few days ago, cause I was trying to run 32M at cas 2-2-2-5 -1T at 215 at 1:1 .... and it didn't like it and corrupted.
since then, I can't get Sisoftsandra to work, so no bandwidth tests yet.
but I can reinstall windows, if anyones real curious to see that.

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43039&stc=1&d=1139140777

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43040&stc=1&d=1139140777

[s7e9h3n]

Maybe I missed it, but I can't find where you mentioned the brand/IC's of your sticks :confused:

[Kunaak]

Corsair 3500 LL Pro.

Infineon is what I was told they are.
I will have to confirm that later.
I can't remove the IHS however.
this ram has some LED on it, and I have no idea how thats hooked to the ram and I don't want to remove it, so I will just have to ask later.

[Vassili]

Is that also game/3D-mark stable?

Very nice result!:slobber:
I've also screwed up the OS a few days ago, cause I was trying to run 32M at cas 2-2-2-5 -1T at 215 at 1:1 .... and it didn't like it and corrupted.
What is the highest 2-2-2-5 run with these sticks?

[MaSell]

vdimm like ddr2 :P

[biohead]

:|

ok how bout everyone with infenion ic's undervolt it and see what happens.
many expert users here so shouldn't be a problem.

weird stuff... there are lots of ocz eb users who cant even get 260 stable. maybe they just need to lower the volts to 2.5...

[stealth17]

how do you set 2.2v when the bios on the Ultra-D is only down to 2.5v, then it overvolts .1v even at that?

DDR Booster?

[Pyr0]

how do you set 2.2v when the bios on the Ultra-D is only down to 2.5v, then it overvolts .1v even at that?

DDR Booster?

Kunaak wrote:

then I got a DFI Expert to use, and that has a option of going down as far as 2.3 volts... luckily it undervolts... so it really went down as low as 2.2 volts in my case... which for once, worked in my favor. ;)

[brandinb]

hey thats pretty cool kunak

i would request a mod in the volt mod section and im sure they can show you how to turn down the v-dimm even lower then 2.2v

[stealth17]

Kunaak wrote:

my bad :yawn2:

[metro.cl]

weird ram

[CCUABIDExORxDIE]

-5b F acted similar for ozzimark too, the lower the voltage the higher. he was thinking of a way to get less voltage, but i dont think he knew about the Expert. ill need to show him this thread.

[Vassili]

Xtreme systems has to make another sub-forum then; Xtreme Low-Volt mod's:p:

[musk]

Corsair 3500 LL Pro.

Infineon is what I was told they are.
I will have to confirm that later.
I can't remove the IHS however.
this ram has some LED on it, and I have no idea how thats hooked to the ram and I don't want to remove it, so I will just have to ask later.


Please post when you confirm the IC's.

are these (http://www.driverheaven.net/reviews/CorsairXMS3500LL/) the modules?

If so;

Lurking underneath the classy but effective heat spreaders, lie Infineon -5 64M X 8 Revision B IC's that have been speed binned by Corsair for use in this product. This is BE-5, or 5 nanosecond RAM, with normal timings of 2-3-3-6. Corsair has shipped these modules with the SPD programmed at 2-3-2-6 at a 1T Command Rate as previously mentioned. In previous iterations of Corsair's 3500LL Rev 1.1 memory, the IC's used were Winbond -5 Rev C, however to due short supply Corsair moved to Infineon IC's which proved quite apt for use in their low latency memory modules.

[Redbeard]

Please post when you confirm the IC's.

are these (http://www.driverheaven.net/reviews/CorsairXMS3500LL/) the modules?

If so;

Lurking underneath the classy but effective heat spreaders, lie Infineon -5 64M X 8 Revision B IC's that have been speed binned by Corsair for use in this product. This is BE-5, or 5 nanosecond RAM, with normal timings of 2-3-3-6. Corsair has shipped these modules with the SPD programmed at 2-3-2-6 at a 1T Command Rate as previously mentioned. In previous iterations of Corsair's 3500LL Rev 1.1 memory, the IC's used were Winbond -5 Rev C, however to due short supply Corsair moved to Infineon IC's which proved quite apt for use in their low latency memory modules.

I work for Corsair, this is exactly right. We initially used the Infineon revCs, but when they were in short supply, we used the Infineon revB ICs.

Right now it really depends on what we have in stock, we're backlogged on the 3500LL because it's such a popular part, luckily we have been able to buy a buttload (technical term) of ICs over the past week or so and it's made a huge dent in our backlog. Keep patient, the modules are shipping out every day by the hundreds.

As for the revB vs. revC, I know revision 1.0 is supposed to be revC, but if you post your revision number in this thread I will let you know for sure which IC is on them. (To the original poster, not to everybody else, that will be a huge headache since I would have to look them up each time...heh.)

[cdelong]

it's nice to have froum support from manufacturers. Thanks!

[ozzimark]

-5b F acted similar for ozzimark too, the lower the voltage the higher. he was thinking of a way to get less voltage, but i dont think he knew about the Expert. ill need to show him this thread.
only when at 3-3-3, 1T though.. probably a limitation of the board's ability to supply power more than anything.

[celemine1Gig]

Nice to know. I bought some Infineon BE-5 based 1GB sticks for a friend. Those sticks are only able to do a stable ~205Mhz while fed with ~2.6V and timings of 2.5-3-3-10. And the worst is, even with 2.5V they get hot. I mean really hot. I think those sticks could be candidates for low voltage vmodding. :)
It's not that hard BTW. Normally you connect a resistor in parallel to get higher volts by slowly decreasing the resistance. To get lower volts (in contrast to this normal method to increase volts) you just need to connect a resistance in series and start to slowly increase from zero upwards. :)

[Kunaak]

I don't see how to find any revision number to the ram.
I am looking at it right now, and other then a serial number, theres nothing to indicate what version they are...

[lowfat]

that is very interesting and impressive :)

[s7e9h3n]

I don't see how to find any revision number to the ram.
I am looking at it right now, and other then a serial number, theres nothing to indicate what version they are...
They don't look like these?
http://images10.newegg.com/NeweggImage/productimage/20-145-594-01.JPG

[chinkgai]

so those of us with the "unlucky" mobo's that dont go 2.2...are we out of luck unless we do some soldering?

[Kunaak]

oh theres the problem then...

see the sticker these are printed on, is extremely cheap.
the ink in the "V1.2" of that picture has just rubbed off, cause thats pretty much the exact point I use to pinch the ram, when pushing it into the socket....
is it possible to get the version number from the serial code or something?
cause that area, is completly gone from both sticks.

anyone that gets this ram, will know exactly what I mean, that stick is like grease, and the ink on it, comes off with almost no effort at all.

here you can see for yourself what I mean...

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43111&stc=1&d=1139259527

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43112&stc=1&d=1139259527

the 1 and 2 on the ram, I wrote myself, so I could remember which stick was the best of the two.
for the record, the first stick does 280 at cas 3-3-2-8-1T easy.
the second stick does 274 cas 3-3-2-8-1T easy.
both stable on thier own.
combined... 262 is the max. same latency.

oh yeah, this ram absolutly must be used in the Orange Slots.
the yellow slots are pure garbage for this ram.
atleast in my case.

Heres my EXACT Bios settings.
one more note...

tras 0.... is also stable at these settings. :D


http://www.xtremesystems.org/forums/attachment.php?attachmentid=43113&stc=1&d=1139259527

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43114&stc=1&d=1139259527

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43115&stc=1&d=1139259527

the Bios I use is 11-18. I believe it was called FX60 Test, when I downloaded it from techpowerup.com
I don't know if this bios is any different from any other, I was having huge troubles with the DR Expert when I got it, cause it wouldn't work with any of my 2 gig ram kits.
with a few emails to DFI and the help of RGone from DFI Street, he gave me a solution that allows me to use 2 gig ram kits in this board without much hassle (boot single channel first, then set your bios settings, shut down, then put the second stick in, if you have problems)
I tried many bios's seeing if any would help my 2 gig problems, none did.
when I finally got the solution from RGone, the 11-18 bios is what I had on there... now I don't want to change it, cause I might jinx something haha... :D

[Redbeard]

oh theres the problem then...

see the sticker these are printed on, is extremely cheap.
the ink in the "V1.2" of that picture has just rubbed off, cause thats pretty much the exact point I use to pinch the ram, when pushing it into the socket....
is it possible to get the version number from the serial code or something?
cause that area, is completly gone from both sticks.

Wow, good feedback. I've never seen the ink rub off our modules before, I'm going to check into that.

I'm almost 100% sure you have the Infineon revC chips there, the revBs don't really clock much over 250 usually. There's another way to know exactly, if you can get me the lot number, it usually starts with 05 or 06 on those, I can find out specifically.

There's also an outside chance it's the Aeneon revC chips, but those are really Infineon revCs anyway.

[chinkgai]

argh, i have aeneon chips that does 245 @ 2.5-3-2...im itching to try this but dont wana solder to lower volts...rofl

kunaak, what exactly did u gain going from regular voltage (2.6-2.7) to 2.2?

[Kunaak]

05512 is about all I can get... thats in the area just under where the version number would have been.
is that it?

kunaak, what exactly did u gain going from regular voltage (2.6-2.7) to 2.2?

honestly.... everything.

heres a summary of my overclocking experiences with this ram.

to run cas 2, you need to use 2.7 volts or alittle more.
2.9 volts and more, is VERY bad for this ram, it just errors out and goes nuts when you try to, and then starts doing lame things, like not booting, so you need to clear the CMOS to get things back to normal.

to run ras to cas 2, you need 2.7 volts as well.
I didn't need any special tweaking to run cas 2-2-2-8 at 1T.

when running cas 2.5, you can go either way, 2.3 volts to 2.7... doesn't seem to matter really. when running cas 2.5 I find the Ram is extremely sensitive, and can need alot of voltage change between one setting to another. so experimenting when getting 2.5 stable is a must.

when running cas 3-3-2... think backwards.
don't think you need more voltage to get more Mhz, go lower.
thats all that I can say about that... lower voltages make it stable.
higher voltages just make it error more.
like 250 at cas 3-3-2 will error in a few minutes of test 5 in Memtest, if the voltage is at 2.5 volts or higher... it does that in my Ultra D and Expert Board.

running cas 3-3-2 is Alot easier then running cas 2.5-3-2.

cas 2-2-2-8-1T to 212 at 2.75 volts.
cas 2-3-2-8-1T 10 230 at 2.75 volts.
cas 2.5-3-2-1-1T to 254 at 2.22 volts
cas 3-3-2-8-1T at 262 at 2.22 volts.

thats my experiences so far.
all tested for stability and have screen shots in my old post about this ram.

in my old post you can read all about my initial experiences learning the quirks of this ram...
but it seems like no one actually has this ram, so I was kinda alone in that post. thats why I just started a new one. results get more attention then questions ;)

http://www.xtremesystems.org/forums/showthread.php?t=85594

Extra Notes I forgot.

when I said "think backwards" I REALLY Mean think backwards.
for me to get 262 stable... I didn't make the ram slower... I made the ram faster.
I take the TRWT, TWTR, TRRD and TWR... and start taking them lower.
making them slower... just makes them error really easily.

I know all of this must sound crazy... but this is just the weirdest ram I ever came across.
to get high OC's stable... you need less voltage... to get even more stable... make the ram even faster.
like I said... think backwards... ;)

[high5]

oh theres the problem then...

see the sticker these are printed on, is extremely cheap.
the ink in the "V1.2" of that picture has just rubbed off, cause thats pretty much the exact point I use to pinch the ram, when pushing it into the socket....
is it possible to get the version number from the serial code or something?
IIRC you should have that information on the packaging near the bar code.

[chinkgai]

05512 is about all I can get... thats in the area just under where the version number would have been.
is that it?



honestly.... everything.

heres a summary of my overclocking experiences with this ram.

to run cas 2, you need to use 2.7 volts or alittle more.
2.9 volts and more, is VERY bad for this ram, it just errors out and goes nuts when you try to, and then starts doing lame things, like not booting, so you need to clear the CMOS to get things back to normal.

to run ras to cas 2, you need 2.7 volts as well.
I didn't need any special tweaking to run cas 2-2-2-8 at 1T.

when running cas 2.5, you can go either way, 2.3 volts to 2.7... doesn't seem to matter really. when running cas 2.5 I find the Ram is extremely sensitive, and can need alot of voltage change between one setting to another. so experimenting when getting 2.5 stable is a must.

when running cas 3-3-2... think backwards.
don't think you need more voltage to get more Mhz, go lower.
thats all that I can say about that... lower voltages make it stable.
higher voltages just make it error more.
like 250 at cas 3-3-2 will error in a few minutes of test 5 in Memtest, if the voltage is at 2.5 volts or higher... it does that in my Ultra D and Expert Board.

running cas 3-3-2 is Alot easier then running cas 2.5-3-2.

cas 2-2-2-8-1T to 212 at 2.75 volts.
cas 2-3-2-8-1T 10 230 at 2.75 volts.
cas 2.5-3-2-1-1T to 254 at 2.22 volts
cas 3-3-2-8-1T at 262 at 2.22 volts.

thats my experiences so far.
all tested for stability and have screen shots in my old post about this ram.

in my old post you can read all about my initial experiences learning the quirks of this ram...
but it seems like no one actually has this ram, so I was kinda alone in that post. thats why I just started a new one. results get more attention then questions ;)

http://www.xtremesystems.org/forums/showthread.php?t=85594

Extra Notes I forgot.

when I said "think backwards" I REALLY Mean think backwards.
for me to get 262 stable... I didn't make the ram slower... I made the ram faster.
I take the TRWT, TWTR, TRRD and TWR... and start taking them lower.
making them slower... just makes them error really easily.

I know all of this must sound crazy... but this is just the weirdest ram I ever came across.
to get high OC's stable... you need less voltage... to get even more stable... make the ram even faster.
like I said... think backwards... ;)


put the man in a locked and padded room. he's a nutshell :p:

i would try to get my hands on this ram, but the 2.2v thing...

[bachus_anonym]

Very interesting, Eric... I was about to say that it's most likely Infineon CE-5 but I we had a "guest appearance" from Corsair :toast: and it's pretty much confirmed now. Your 3500LL is OCing very nicely :up:
As for the "ink smudging"... Yeah, this is something than should be looked into. I had exactly same thing happened while testing TWINX2048-4400PRO (http://www.xtremesystems.org/forums/showthread.php?t=84343) last December...

[brandinb]

cmon whip out the soldering iron and give it 1.8-2.1v and see what it does im really curious if the trend will continue hehe

[Kunaak]

As for the "ink smudging"... Yeah, this is something than should be looked into. I had exactly same thing happened while testing TWINX2048-4400PRO (http://www.xtremesystems.org/forums/showthread.php?t=84343) last December...

Bachus, thanks for bringing that up.
at first I felt like abit of a liar having to say that.
I really wish I could just say the revision number, but like I said, that area, is the exact area I use to push the ram into the socket and didn't notice that the ink smudges off, until a few weeks later.

I really wish I could give this ram less voltage.
I am incredibly curious to see what would happen.
wouldn't that be weird, if we had some DDR ram here... that has DDR2 chips on it or something... haha...

[Major]

Eric, does your PSU have an adjustable 3.3v rail ?

[Kunaak]

Eric, does your PSU have an adjustable 3.3v rail ?

no, the PSU in the PC Using this ram at the moment, is this one here.


http://www.newegg.com/Product/Product.asp?Item=N82E16817182028

in my Main PC however, I do have a OCZ 600 Watt PSU, that is adjustable.
whats your idea? ;)

[Major]

in my Main PC however, I do have a OCZ 600 Watt PSU, that is adjustable.
whats your idea? ;)

I just thought if the 3.3v rail was adjustable you might be able to drop your Vdimm down another .2v or so by lowering the 3.3v rail below 3v (if it would adjust down that much)

[OV3RCLOCK3R]

Very weird but at the same time very impressive. :)

[[cTx]Philosophy]

definately wierd
I think my ram is this but I have a helluva hard time removing the spreaders...
I have the Patriot extreme performance 3200LL and mine do 2.5-3-2-5 1T at around 250ish
I dont rely on memtest naymore for stability
Heres a linly to the ram but mine were bought maybe 6 months ago

http://www.newegg.com/Product/Product.asp?Item=N82E16820220045

[bachus_anonym]

@Kunaak,

You just made me try my Corsair 2GB (also Infineon CE-5 but on 4400PRO) to see how low I can go on Ultra-D :D. As we know, Ultra-D means 2.5v (2.51v with DMM on my board). MAXes I got @ 2.5v are a bit lower compared to what they can do with a bit more volts but still, also interesting results:
SPi 32M @ 254MHz 5-2-3-2.5-1T, 2.5v (http://www.xtremesystems.org/forums/attachment.php?attachmentid=43145)
and
SPi32M @ 275MHz 5-2-3-3.0-1T, 2.5v (3D stable up to 271MHz, though. Not voltage-related but IC specific issue) (http://www.xtremesystems.org/forums/attachment.php?attachmentid=43125)

I wish I had DFI Expert to try for lower voltages... :)

[STEvil]

let the under-volt mod craze begin, again! No longer is it just for silent HTPC's lol ;)

[chinkgai]

@Kunaak,

You just made me try my Corsair 2GB (also Infineon CE-5 but on 4400PRO) to see how low I can go on Ultra-D :D. As we know, Ultra-D means 2.5v (2.51v with DMM on my board). MAXes I got @ 2.5v are a bit lower compared to what they can do with a bit more volts but still, also interesting results:
SPi 32M @ 254MHz 5-2-3-2.5-1T, 2.5v (http://www.xtremesystems.org/forums/attachment.php?attachmentid=43124)
and
SPi32M @ 275MHz 5-2-3-3.0-1T, 2.5v (3D stable up to 271MHz, though. Not voltage-related but IC specific issue) (http://www.xtremesystems.org/forums/attachment.php?attachmentid=43125)

I wish I had DFI Expert to try for lower voltages... :)


what were u able to get before u dropped the voltage?

[bachus_anonym]

what were u able to get before u dropped the voltage?a bit more - http://www.xtremesystems.org/forums/showthread.php?t=84343

[thegoatman]

lol I can see it now... (not seriously) try cutting the leads that supply voltage to the RAM, and I bet it takes off, DDR1000@.25-.5-.5-2 at 0.0 volts or something lol!
Can electronics be damaged by undervolting by any chance?

[brandinb]

lol I can see it now... (not seriously) try cutting the leads that supply voltage to the RAM, and I bet it takes off, DDR1000@.25-.5-.5-2 at 0.0 volts or something lol!
Can electronics be damaged by undervolting by any chance?

i think the regulators can get hurt depending on the design if you go way too low.

the ram will not be hurt thats for sure

[Coroner Kyle]

Very nice results. I've got 3500LL rev 1.1 I'll have to see what I can get w/ low volts.

[Kunaak]

2 days burning in on test 5 in Memtest 86, and not a single error.

254 cas 2.5-3-2-0 at 1T @2.2 volts.
no errors at all. :banana:

[Shinuza]

ROFL 1698 pass :D

[Kunaak]

ROFL 1698 pass :D

when I burn in something, I don't fool around... I mean BURN IN... not 2 hours... not 7 hours... 2-3 days atleast... consistantly, and almost no cooling to the ram.
my ram fan is only on... when benchmarking.
for burning in... let it fry. :D

[dickeywang]

Wow!!I'll try to reduce voltage on my crappy PQI 3200-2048DB to see if it helps.I can only reaches 218Mhz with stock voltage @2.6v and for some reason these two sticks don't like any voltage higher than that at all, maybe they will like 2.5v :)

[celemine1Gig]

Wow!!I'll try to reduce voltage on my crappy PQI 3200-2048DB to see if it helps.I can only reaches 218Mhz with stock voltage @2.6v and for some reason these two sticks don't like any voltage higher than that at all, maybe they will like 2.5v :)

As I said, I assembled a system for a friend of mine, with 1GB BE-5 sticks and they clock about the same. Not even stable at 220Mhz, regardless of timings, volts etc. Will see if I can try them on a modded board with lower volts in some weeks.

[setyotomo]

wow.. this is like opening a new dimension of overclocking... very2 weird and interesting.. keep us posted kunaak.. *subscribed*

[thegoatman]

I wonder if lower volts will make Micron -5b D chips last longer while still OCing at the insane ballistix speeds?

[[XC] DragonOrta]

for burning in... let it fry. :D Says Kunaak when running at 2.2v. ROLF

[guess2098]

man! i try my old old G.skill HX BE kit..... OMG it really does 2.4v at 250...

that is really nice found Kunaak :up:

there is some result with my old GBHX BE (sux gskill doesn't make it anymore!)

http://premium1.uploadit.org/guess2098/ram/021101.JPG

http://premium1.uploadit.org/guess2098/ram/021103.JPG

http://premium1.uploadit.org/guess2098/ram/021104.JPG

i am going to try 2-2-2-5 .... man Kunaak you are :up:

[bachus_anonym]

Haha, this is getting more interesting day after day... Weird ICs those Infineons are :D

[5-Clicks]

lol wow. who'd have ever thought! it's kind of surprising that, say, OCZ or Corsair haven't found this out yet or heck even Infineon. wouldn't they have typically tested at the lowest volts possible at a certain speed? if OCZ or Mushkin had found this out first, that's good for advertising if you ask me. DDR500 at 2.2v! (of course, <1% of the PC world is going to have Expert boards that can go that low).

[Kunaak]

damn I am glad to see others can do the same kinda stuff I can, if they have certain Infineon ram too.
its weird to say, but when you post something like that, that almost clearly looks like BS... it's kinda hard to speak up, even when you know 100% the truth. I am glad others can redo my results, so I don't feel like this is just fluke with my particular hardware.

[ahmad]

I don't get that. Weak drive strength and 2.2v......

................ ..... ........... ......... ...

Now that I am past my confusion (...), what is the max you can do at 2.2v and level 8 drive strength?

What about MAL of 7 or 8? I found that higher mal gives lower clocks with CEs... but maybe not at 2.2v.

[guess2098]

damn I am glad to see others can do the same kinda stuff I can, if they have certain Infineon ram too.
its weird to say, but when you post something like that, that almost clearly looks like BS... it's kinda hard to speak up, even when you know 100% the truth. I am glad others can redo my results, so I don't feel like this is just fluke with my particular hardware.
for the real ocer, the 1st thing is not to post
this is BS
he or she should get some same chip and hardware to test it
then gives his her result

do it befor post it!

Kunaak :up:

[[XC] moddolicous]

ROFL 1698 pass :D
Wanna see 300 hrs with ONLY 45x passes??
http://img218.imageshack.us/my.php?image=im0000475hc.jpg

[cMw]

wow thats some crazy :banana::banana::banana::banana: guys

[Kunaak]

heres some new stuff.

easily passes 3dmark, and gaming.

the prime 95 shot failed after 10 hours and 15 minutes.
but that could easily have been from the CPU being unstable too, as I have not tested the CPU for stability at all. only the ram...
I don't want to bother with prime 95 anymore since it doesn't really help me figure out where problems lie...

finally got sisoft sandra working again.
aparantly I had some necessary service disabled, so it wouldn't do anything.
here I thought I corrupted the OS... :rolleyes:

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43463&d=1139960650

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43464&d=1139960650

http://www.xtremesystems.org/forums/attachment.php?attachmentid=43465&d=1139960650

[biohead]

jeez that's almost BH-5 upside down lol

[Aleman]

Mh is there a chance that my PQI TURBO (2-3-2-5 // 2 x 1 GB) will OC with less volts? There is a Thread ( I looked for it , really did not find it ) where many guys were able to OC the sticks up to 260ish with 2.8V and some with 2.7V but im not even able to OC to 230MHz using WHATEVER TIMMING nor VOLTS (not even 2.5V)

What i mean, any chance of knowing the chips (if any knows em :P) i dont wanna open the heatsperaders, rather sell em before that, sure am OC'er, just don't wanna do that since i dont even have an DFI Expert (lack of money).

[dmon]

I bought 2x1gb of Kingston value ram with uccc chips on them and they clock higher the lower I go with the volts. So maybe it's not just the Infineons. I'm still on a Dfi 250gb so I'm hoping the bios can be modded for lower volts.

[Tulatin]

A little necromancy here, sorry boys. I've found Kunaak's erroring problem with high volts (2.9) to happen with my kit. Yet, it refuses to stabilize at anything above 285 unless fed 2.93V! Priming up 290 right now, dualing, 1:1 with a nice 3200 :)

[Kunaak]

thats with the Corsair XMS 3500 LL Pro 2 gig kit??

[Tulatin]

Yep it is. Bloody stuff gets HOT though.

[Kunaak]

I wonder what revision yours is...
it seems to be drastically different from your revision to mine.

mine seems to only get better with low voltages, while it won't pass 265 at all, while others can't do the low voltages like mine can, but get into the 280's....

[Tulatin]

Weird. As to refresh rates, i tried a few and the only one that stabilized 290 was yours. Thanks for that :)

[dinos22]

strange find

have you tried OCZ PSU and lowering 3.3v rail

[thegoatman]

wouldn't that just do less amps?or does it lower the voltages?

[mikeyyy]

both... because there's less voltage, less amps go through the RAM

[celemine1Gig]

Uhhhm, lowering the 3.3V rail shouldn't have any effect on the VDimm though (unless you lower it to really unhealthy levels perhaps). The circuit is designed to deliever a certain VDimm regardless of the input voltage being a bit higher or lower than 3.3V. Lowering the 3.3V rail won't do the trick. You have to mod the vdimm circuit directly to get the real lower VDimm.

[STEvil]

most motherboards are limited by the input of the +3.3v source. You could set the PSU to 2.2v, but then other stuff thats attached is going to have problems..

[celemine1Gig]

most motherboards are limited by the input of the +3.3v source. You could set the PSU to 2.2v, but then other stuff thats attached is going to have problems..

That's exactly what I meant to say. You could set the 3.3V-rail to ~3V thus you still keep the other things up and running in more or less good condition. But that wouldn't get VDimm any lower. Or you limit Vdimm to a max. of 2.2V by setting the 3.3V-rail to about the same level of ~2.3-2.2V. But then the other parts that depend on the 3.3v rail would most likely not like that. :stick:

Doing a simple VMod, just the other way round than the usual procedure should be the solution. Increasing the resistance instead of decreasing it. Cutting the trace to the feedback pin and inserting a adjustable resistor or replacing a existing resitor with a adjustable version (set to a start-value of the resistor that was replaced) should do the trick.

I'd try it, but ATM I don't even have a system here to test with. :) No S939 CPU and no system to experiment with. :(

[oohms]

I have 2x512m corsair 3200 cas 2 ram rated at 2-3-3-8 that has Promos -5 Rev A chips on it.
They also work best at 2.5 volts but i will try and get lower voltages :D

This is pretty much what they are capable of (test #5)
2-3-3-8 215
2.5-3-3-8 255
2.5-4-4-8 255
3-3-3-8 280
3-4-4-8 300

They are stable for about 20 minutes, until they heat up (a LOT) and then they start producing 1 or 2 errors every pass or so...
Is it worth removing the corsair heatspreaders (the standard platinum ones) or are they actually helping in this case?
The rams are also right next to each other on the mobo but not a lot i can do about that :(

[CandymanCan]

From what im getting @ Infineon chips like low voltage. Maybe i should try this.

Setting youre refresh period to 4708 will lower youre memory bandwidth btw. You may get a higher overclock but itll just contridict itself

[DaWaN]

I have 2x512m corsair 3200 cas 2 ram rated at 2-3-3-8 that has Promos -5 Rev A chips on it.
They also work best at 2.5 volts but i will try and get lower voltages :D

This is pretty much what they are capable of (test #5)
2-3-3-8 215
2.5-3-3-8 255
2.5-4-4-8 255
3-3-3-8 280
3-4-4-8 300

They are stable for about 20 minutes, until they heat up (a LOT) and then they start producing 1 or 2 errors every pass or so...
Is it worth removing the corsair heatspreaders (the standard platinum ones) or are they actually helping in this case?
The rams are also right next to each other on the mobo but not a lot i can do about that :(

Wow awesome results from those Elcheapo Promos IC's :slobber: Do you put a fan on top of the memory's ? And removing the heatspreaders helps most of the time a little bit and sometimes it doesn't matter. You want to keep them on for the warranty, that's a personal choice.

[NinjaWreck]

My 2 x 1Gb Infineon BE-5 @ 2.5volts lowest DFI will go for me 510mhz @ 2.5-3-2-0:

http://valid.x86-secret.com/show_oc?id=75197

This is 32m Super PI stable and gaming stable.

[Dr.Leary]

Would it be possible to mod A DFI Ultra-D bios to give lower voltages than 2.5?

[celemine1Gig]

Everything is possible in a certain way, but I doubt that it'll be easy.

Perhaps DFI would add these options down to 2.2V or even lower, if only enough people would ask the support to do so. :) Could be worth a try.

Edit: Just checked the latest BIOS file for the NF4 Ultra-D and thee's no hidden option for a lower Vdimm than the defualt 2.5V. :( So, if you don't find a BIOS guru to fix that, the only way will be to really ask the DFI support for help (or do a Vdimm Mod :D ).

[Rolf]

I have 2x512m corsair 3200 cas 2 ram rated at 2-3-3-8 that has Promos -5 Rev A chips on it.
They also work best at 2.5 volts but i will try and get lower voltages :D

This is pretty much what they are capable of (test #5)
2-3-3-8 215
2.5-3-3-8 255
2.5-4-4-8 255
3-3-3-8 280
3-4-4-8 300

They are stable for about 20 minutes, until they heat up (a LOT) and then they start producing 1 or 2 errors every pass or so...
Is it worth removing the corsair heatspreaders (the standard platinum ones) or are they actually helping in this case?
The rams are also right next to each other on the mobo but not a lot i can do about that :(

That sounds reaalllyyyy interesting! :eek:

[guess2098]

BE-5 :up: but super hard to find.....
and BE-5 looks like no 3D problem

[happyhero]

does anyone know what ic's rev 1.3 is. as it needs volts to go higher. and fails if i lower the volts to low.
2.5-3-2-5 245 2.6v fails
2.5-3-2-5 245 2.71v success

[M_com]

I work for Corsair, this is exactly right. We initially used the Infineon revCs, but when they were in short supply, we used the Infineon revB ICs.

Right now it really depends on what we have in stock, we're backlogged on the 3500LL because it's such a popular part, luckily we have been able to buy a buttload (technical term) of ICs over the past week or so and it's made a huge dent in our backlog. Keep patient, the modules are shipping out every day by the hundreds.

As for the revB vs. revC, I know revision 1.0 is supposed to be revC, but if you post your revision number in this thread I will let you know for sure which IC is on them. (To the original poster, not to everybody else, that will be a huge headache since I would have to look them up each time...heh.)
seems like this is what the ic' are.
rev 1.0 Infineon -5 Rev C
rev 1.1 Infineon -5 Rev B
rev 1.2 Infineon -5 Rev C
rev 1.3 Infineon -5 Rev C

I have rev 1.3 Infineon -5 Rev C

[Tulatin]

fall back to CAS 3 and press on.

[M_com]

fall back to CAS 3 and press on.i will see what i can do. thanks .

[Tulatin]

See you @ 280 :toast:

[M_com]

testing at 275mhz 3-3-2-8 7-14 1T 2.87vDIMM TREF-3120 all other setting at auto.

any hints if i hit a wall?

[Poodle]

seems like this is what the ic' are.
rev 1.0 Infineon -5 Rev C
rev 1.1 Infineon -5 Rev B
rev 1.2 Infineon -5 Rev C
rev 1.3 Infineon -5 Rev C

I have rev 1.3 Infineon -5 Rev C


So is there any other dif. than IC's from rev. 1.2 to 1.3? Why did they change the revision nr?


Mine are rev 1.2 and @ 2,6V, I can get 229mhz@2,3,2,6 memtest stable and 227mhz@same in the memtest #5 test. (havn't tried higher@#5 but I rekon 227 is as high as the can go)



Don't stop posting this thread is really something. And where's that rep guy from the pirate boat company, where U at? ;)


@Kunaak. How you tried to find out the ICs and revision nr with help from the Corsair rep?

Thanks...

[high5]

v1.2 has to be Infineon BE-. most 3500LL Pro review samples were v1.2 and they were all topping around 250MHz with no gains in MHz when going from Cas 2.5 to 3. that's typical for rev B.

and BTW i don't think v1.0 exists.

[halo112358]

Huh, those sticks are freakish .. I have a 2x1gb set of Aeneon (infineon) sitting here ;-) maybe I'll see what's up *cross fingers*

[raju]

Hi Kunaak,

so far I've managed this, running ram @ 216mhz, 225htt, 2.5-3-2-6 with my 4800X2 cpu,


running ram @ 216mhz gives an effective memory speed of 245.5mhz, this is @ 2.7v. I have not tried higher.

I don't think my ram has the ability to go as high and tight as yours though, I am using DFI CFX3200. 2.7 ghz is completley stable, I can get upto 2.8 and run super pi 1M, but it is not satble in S&M stress test with a 100% load, as I am only using air cooling.


Raja

edit I'll try knocking down a bit, as this board allows right down to 2.01v for the ram..

[Kunaak]

well give it a shot...
I been wanting to see what happens on that board.
unfortunatly, theres about 3 revisions of this ram, and I have no idea what mine is, cause the paint on the sticker wore off a long time ago, as I said a few posts ago, and Bachus showed as well.

so don't be suprised if your ram doesn't do low voltage overclocking...
so far I have only seen 2-3 other people get better OC's with lowering thier volts instead of going higher.

but it's certainly worth a shot.

[turbotoaster]

ive got the rev2 3500 pro 2gig sticks

im 3d mark and super pi stable at

260 2.5,3,2,0 1T 2.6v

if that helps anybody

[raju]

Hi,

It's revision 1.3, I bought it this year, from what I hear, it probably won't overclock as well as some of the older stuff.


ATM I've found that I can use it @2.3v with the same settings.

Raja

[ted34]

Tryin to get rev1.3 of these sticks stable at 2,3,2,0 at 223 mhz and cant. Board is dfi expert. Seems to need more volts rather than less to help stability and have followed bios settings as in 1st page screen shots. Any ideas to help stability. Am using orange slots on board.

[nn_step]

very unique

[ted34]

From what im getting @ Infineon chips like low voltage. Maybe i should try this.

Setting youre refresh period to 4708 will lower youre memory bandwidth btw. You may get a higher overclock but itll just contridict itself

Isnt it the other way round: 4708 makes it faster than a lower refresh rate. I have got faster memory speed in memtest by raising this value - only lower it if having problems getting stable.


Finally got my rev1.3 sticks stable. Couldnt get them stable at 223 2,3,2,0 no matter what i did. I copied original bios settings in first page and didnt help - lowered volts (made it worse but higher volts improved it but didnt make it stable). Now running with with 2.6v stable after setting drive strength to 6 - made a massive difference to stability with my sticks so might be something for others to try if having probs with rev1.3 sticks